Management method and system for effective establishment of nuclear power plant spare part initial inventory

Abstract

The invention discloses a management method for effective establishment of a nuclear power plant spare part initial inventory, and relates to the technical field of nuclear power plant spare part management, comprising the following steps: collecting historical data of spare parts, and preprocessing the extracted data; determining importance scores of the spare parts according to the comprehensive influence and risk cost of the spare parts; according to the consumption probability of the spare parts, determining corresponding spare part demand; based on the initial stock amount and the spare part demand amount, the spare parts with high importance scores are subjected to combined storage, and the combined storage amount of the spare parts is calculated after comprehensive consideration. Through collection and preprocessing of spare part data, calculation of spare part importance scores, prediction of spare part demand quantity and calculation of spare part joint reserve quantity, effective establishment and management of the nuclear power plant spare part initial inventory are realized, the efficiency and economic benefits of spare part management are improved, the problems in existing spare part management are solved, and the economic benefit of the nuclear power plant is improved. Scientific and efficient spare part management is ensured, and the method is of great significance to improvement of safety and stability of nuclear power plant operation.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power plant spare parts management, in particular to a management method and system for effectively establishing an initial inventory of nuclear power plant spare parts. Background Art

[0002] As an important energy supply facility, nuclear power plants play an irreplaceable role in ensuring national energy security and promoting economic development. Effective management of spare parts is crucial to ensure the stable operation of nuclear power plants. With the continuous development of the nuclear energy industry and technological advancement, nuclear power plant spare parts management has gradually introduced advanced information technology to improve the efficiency and reliability of spare parts management. However, the existing spare parts management system still has some shortcomings, especially in the establishment of the initial spare parts inventory.

[0003] Traditional spare parts management methods often rely on empirical judgment and simple historical data analysis, which is difficult to adapt to the complex and changing operating environment of modern nuclear power plants. For example, traditional management methods may not fully consider the comprehensive impact and risk cost of spare parts, which may lead to insufficient or excessive reserves of important spare parts, thereby affecting the safe and stable operation of nuclear power plants or causing waste of resources. In addition, traditional methods often use a single historical data trend analysis when predicting spare parts demand, ignoring the randomness and uncertainty of spare parts consumption, thereby reducing the prediction accuracy. Furthermore, the joint reserve strategy of spare parts often lacks scientific basis in practice, resulting in high inventory costs and low actual utilization, or insufficient inventory affecting emergency response capabilities. Summary of the invention

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a management method for effectively establishing the initial inventory of spare parts for nuclear power plants to solve the problem that the existing spare parts management method fails to effectively evaluate the importance and demand of spare parts, resulting in unreasonable initial inventory of spare parts for nuclear power plants, which in turn causes waste of resources or shortage of spare parts.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a management method for effectively establishing an initial inventory of spare parts for a nuclear power plant, which comprises:

[0008] Collect historical data of spare parts and pre-process the extracted data;

[0009] Determine the importance score of spare parts based on their comprehensive impact and risk cost;

[0010] Determine the corresponding spare parts demand based on the spare parts consumption probability;

[0011] Based on the initial inventory and spare parts demand, spare parts with higher importance scores are jointly reserved, and the joint reserve of spare parts is calculated after comprehensive consideration.

[0012] As a preferred solution for the management method of effectively establishing the initial inventory of nuclear power plant spare parts described in the present invention, the historical data includes the price, frequency of use, mean time between failures and mean time to repair of spare parts; and the preprocessing includes data cleaning and standardization processing.

[0013] As a preferred solution of the management method for effectively establishing the initial inventory of spare parts for nuclear power plants according to the present invention, the step of determining the importance score of spare parts according to the comprehensive impact and risk cost of spare parts comprises the following steps:

[0014] Calculate the comprehensive impact factor I of spare parts i , the formula is,

[0015]

[0016] Calculate the risk cost factor R of spare parts i , the formula is,

[0017]

[0018] Determine the importance score of the spare part i , the formula is,

[0019]

[0020] Among them, t i is the task time of the i-th spare part, l i is the expected life of the i-th spare part, f i is the failure frequency of the ith spare part, c i is the cost of the i-th spare part, r i is the repair time of the i-th spare part, s i is the supply time of the i-th spare part, u i is the unavailable time of the i-th spare part, p i is the purchasing difficulty of the i-th spare part, v i is the replacement cost of the i-th spare part, d i is the potential loss of the i-th spare part, w i is the importance score of the i-th spare part, and N is the total number of spare parts.

[0021] As a preferred solution of the management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to the present invention, the demand for the corresponding spare parts is determined according to the consumption probability of the spare parts, including the following steps:

[0022] For each device p, calculate the task time T p The probability R of consuming k spare parts within a period 1+k , the probability is calculated by the following formula:

[0023]

[0024] Where a is the inverse of the expected value of the spare part life, b is the inverse of the expected value of the maintenance time, x, y, z represent the k-th maintenance time, the first k-1 maintenance times, and the total life of the equipment before the k-th spare part is installed, respectively;

[0025] Use convolution operation to integrate the probability array of all equipment consuming k spare parts to calculate the probability array of integrated l spare parts;

[0026] When all equipment consumes k spare parts, calculate the total probability G of consuming the first l+n spare parts, that is, the spare parts guarantee probability:

[0027]

[0028] Among them, T l+k It is the probability of consuming l spare parts after all equipment consumes k spare parts;

[0029] Initialize the spare parts quantity n=0 and the spare parts guarantee probability G=0. For each device, repeatedly calculate the spare parts consumption probability and accumulate the spare parts quantity until G is greater than the preset spare parts guarantee probability threshold K. When the spare parts guarantee probability G exceeds the threshold K for the first time, the current spare parts quantity n is the required spare parts demand.

[0030] As a preferred solution of the management method for effectively establishing the initial inventory of spare parts for nuclear power plants according to the present invention, the initial inventory is determined by a comprehensive calculation method, which is expressed as:

[0031]

[0032] Among them, Y i is the initial inventory of spare parts, F i is the comprehensive score of the i-th spare part, G j is the weighted score of the price and mean failure interval of the jth spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, C i is the cost index of the i-th spare part, avg(C) is the average cost index of all spare parts, MTBF i is the mean time between failures of the i-th spare part, MTTR i is the average repair time of the i-th spare part, Usa iis the usage frequency of the i-th spare part, max(Usa) is the highest usage frequency among all spare parts, S i is the safety stock factor of the ith spare part, which is based on the importance and price level of the spare part, and N is the number of spare parts.

[0033] As a preferred solution of the management method for effectively establishing the initial inventory of nuclear power plant spare parts according to the present invention, the cost index expression of the spare parts is:

[0034]

[0035] Among them, C i is the cost index of the i-th spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, and w i is the importance score of the i-th spare part, and avg(S) is the average importance score of all spare parts;

[0036] The safety stock factor expression of the spare parts is:

[0037]

[0038] Among them, S i is the safety stock factor of the i-th spare part, P i is the price of the i-th spare part, avg(P) is the average price of all spare parts, and w i Score the importance of the i-th spare part.

[0039] As a preferred solution of the management method for effectively establishing the initial inventory of spare parts for nuclear power plants according to the present invention, the spare parts with importance scores exceeding the average importance of all spare parts are jointly reserved, and the formula is:

[0040]

[0041] Among them, J i is the joint reserve quantity of the i-th spare part, n i is the spare parts demand of the i-th spare part, avg(w) is the mean of the importance scores of all spare parts, σ S The standard deviation of the importance scores for all spare parts.

[0042] In a second aspect, the present invention provides a management system for effectively establishing an initial inventory of spare parts for a nuclear power plant, comprising:

[0043] Data collection module, responsible for collecting historical data of spare parts;

[0044] The preprocessing module is responsible for preprocessing the extracted data;

[0045] The spare parts importance assessment module is responsible for determining the importance score of spare parts based on their comprehensive impact and risk cost;

[0046] The demand forecasting module is responsible for determining the corresponding spare parts demand based on the spare parts consumption probability;

[0047] The inventory optimization module is responsible for jointly reserving spare parts with higher importance scores based on the initial inventory and spare parts demand.

[0048] In a third aspect, an embodiment of the present invention provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: when the computer program is executed by the processor, it implements any step of the management method for effectively establishing an initial inventory of spare parts for a nuclear power plant as described in the first aspect of the present invention.

[0049] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium having a computer program stored thereon, wherein: when the computer program is executed by a processor, it implements any step of the management method for effectively establishing an initial inventory of spare parts for a nuclear power plant as described in the first aspect of the present invention.

[0050] The beneficial effects of the present invention are as follows: by collecting and preprocessing spare parts data, calculating spare parts importance scores, predicting spare parts demand, and calculating spare parts joint reserves, effective establishment and management of the initial inventory of nuclear power plant spare parts is achieved, the efficiency and economic benefits of spare parts management are improved, the problems existing in existing spare parts management are solved, the scientificity and efficiency of spare parts management are ensured, and it is of great significance to improving the safety and stability of nuclear power plant operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0052] Figure 1 Flow chart of the management method for effectively establishing the initial inventory of spare parts for a nuclear power plant in Example 1. DETAILED DESCRIPTION

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0054] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0055] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0056] Example 1, reference Figure 1 , which is the first embodiment of the present invention, provides a management method for effectively establishing an initial inventory of spare parts for a nuclear power plant, comprising the following steps:

[0057] S1. Collect historical data of spare parts and pre-process the extracted data;

[0058] Collect historical data on spare parts, including, identifying data sources, including equipment maintenance management systems, spare parts management systems, equipment management systems, fault reporting systems, and historical purchase orders;

[0059] Extract historical data of nuclear power plant spare parts from the existing information system of the nuclear power plant, including equipment maintenance records, fault reports and spare parts receipt records;

[0060] Historical data includes spare parts price, usage frequency, mean time between failures, and mean time to repair;

[0061] Design data collection forms and clearly define the data fields that need to be collected, such as spare part number, name, specification model, price, date of receipt, frequency of use, fault report and maintenance record;

[0062] Preprocessing of the extracted data includes cleaning the data, removing invalid or missing values, correcting erroneous entries, unifying the data format, and performing data standardization to ensure that numerical attributes are compared within the same range, such as using Z-score standardization and Min-Max normalization methods.

[0063] S2. Determine the importance score of spare parts based on their comprehensive impact and risk cost;

[0064] Furthermore, the comprehensive impact factor I of spare parts is calculated i , the formula is,

[0065]

[0066] Calculate the risk cost factor R of spare partsi , the formula is,

[0067]

[0068] Determine the importance score of the spare part i , the formula is,

[0069]

[0070] Among them, t i is the task time of the i-th spare part, l i is the expected life of the i-th spare part, f i is the failure frequency of the ith spare part, c i is the cost of the i-th spare part, r i is the repair time of the i-th spare part, s i is the supply time of the i-th spare part, u i is the unavailable time of the i-th spare part, that is, the duration during which the equipment cannot work normally from the time the spare part fails to the time it is repaired, p i is the difficulty of purchasing the i-th spare part, quantifying the difficulty of purchasing spare parts, v i is the replacement cost of the i-th spare part, including the cost of the spare part itself plus the installation and testing costs, d i is the potential loss of the i-th spare part, which refers to the loss of production stagnation or safety risk caused by spare part failure, and w i is the importance score of the i-th spare part, N is the total number of spare parts;

[0071] When i When it is close to 0, it means that the importance of the i-th spare part is low, which means that it has a small impact on the overall system and the inventory can be appropriately reduced;

[0072] When i When it is close to 0.5, it means that the importance of the i-th spare part is average, and it is necessary to maintain an appropriate inventory to deal with possible problems;

[0073] When i When it is close to 1, it means that the i-th spare part is very important and sufficient inventory must be ensured to prevent system operation from being interrupted or suffering major losses.

[0074] S3. Determine the demand for corresponding spare parts according to the consumption probability of spare parts;

[0075] Furthermore, for each device p, calculate the task time T p The probability R of consuming k spare parts within a period 1+k , the probability is calculated by the following formula:

[0076]

[0077] Where a is the inverse of the expected value of the spare part life, b is the inverse of the expected value of the maintenance time, x, y, z represent the k-th maintenance time, the first k-1 maintenance times, and the total life of the equipment before the k-th spare part is installed, respectively;

[0078] Use convolution operation to combine the probability arrays of all devices consuming k spare parts to calculate the probability array P of combining 1 spare part l , expressed as,

[0079]

[0080] Among them, * is the convolution operator;

[0081] When all equipment consumes k spare parts, calculate the total probability G of consuming the first l+n spare parts, that is, the spare parts guarantee probability:

[0082]

[0083] Among them, T l+k It is the probability of consuming l spare parts after all equipment consumes k spare parts;

[0084] Initialize the spare parts quantity n = 0, spare parts guarantee probability G = 0, for each device, repeatedly calculate the spare parts consumption probability and accumulate the spare parts quantity until G is greater than the preset spare parts guarantee probability threshold K. When the spare parts guarantee probability G exceeds the threshold K for the first time, the current spare parts quantity n is the required spare parts demand;

[0085] When G is close to 1, it means that the probability of spare parts guarantee is very high and the spare parts demand is close to the maximum value, which is suitable for critical equipment or high-value spare parts. When G is close to 0.5, it means that the probability of spare parts guarantee is moderate and the spare parts demand is moderate, which is suitable for general equipment or medium-value spare parts. When G is close to 0, it means that the probability of spare parts guarantee is very low and the spare parts demand is close to the minimum value, which is suitable for non-critical equipment or low-cost spare parts.

[0086] S4. Use comprehensive calculation method to determine the initial inventory;

[0087] The comprehensive calculation formula is as follows:

[0088]

[0089] Among them, Y i is the initial inventory of spare parts, F i is the comprehensive score of the i-th spare part, G j is the weighted score of the price and mean failure interval of the jth spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, Ci is the cost index of the i-th spare part (considering the importance and price level of the spare part), avg(C) is the average cost index of all spare parts, MTBF i is the mean time between failures of the i-th spare part, MTTR i is the average repair time of the i-th spare part, Usa i is the usage frequency of the i-th spare part, max(Usa) is the highest usage frequency among all spare parts, S i is the safety stock factor of the ith spare part, which is based on the importance and price level of the spare part, and N is the number of spare parts.

[0090] Y i The value range of is a positive real number. The larger the value, the more frequent the demand for spare parts or the more important the spare parts are. Therefore, more initial inventory is needed to ensure sufficient supply. i The value range of G is a positive real number. The larger the value, the higher the comprehensive score of the spare part. j The value range of is a positive real number. The larger the value, the higher the weighted score of the spare parts price and the mean failure interval time.

[0091] S5. The cost index expression of spare parts is:

[0092]

[0093] Among them, C i is the cost index of the i-th spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, and w i is the importance score of the i-th spare part, and avg(S) is the average importance score of all spare parts;

[0094] Cost Index C i It consists of two parts:

[0095] Part I It reflects the ratio of the spare parts price to the highest price among all spare parts. The higher the price of spare parts, the higher the cost index.

[0096] Part 2 Reflects the relationship between the importance score of a spare part and the average importance score of all spare parts. The higher the importance score, the lower the cost index of the spare part. This is because spare parts with high importance scores need to be managed more carefully and may require higher safety stocks, which reduces their cost index;

[0097] By multiplying these two parts together, we can get a cost index that takes both price and importance into account, which can be used to help decide on spare parts management strategies;

[0098] The safety stock factor expression of the spare parts is:

[0099]

[0100] Among them, S i is the safety stock factor of the i-th spare part, P i is the price of the i-th spare part, avg(P) is the average price of all spare parts, and w i Score the importance of the i-th spare part;

[0101] Safety stock factor S i It consists of two parts:

[0102] Part I It reflects the ratio of the spare parts price to the average price of all spare parts. The higher the price of spare parts, the lower the safety stock factor, because high-priced spare parts need to be managed more carefully to reduce unnecessary inventory costs;

[0103] The second part (1+log(w i +1)) reflects the importance score of the spare parts. The higher the importance score, the higher the safety stock factor of the spare parts. This is because spare parts with high importance scores need to be managed more carefully to ensure that they can be supplied in time when needed;

[0104] By multiplying these two parts together, we can get a safety stock factor that takes into account both price and importance, which can be used to help determine the amount of safety stock to keep for spare parts.

[0105] S6. Jointly reserve spare parts whose importance score exceeds the average importance of all spare parts;

[0106] Furthermore, using the initial inventory as a basis, spare parts with importance scores exceeding the average importance of all spare parts are jointly reserved;

[0107] For each spare part, determine whether the importance score exceeds the importance mean. If the importance score of the spare part exceeds the importance mean, perform joint reserve calculation. The calculation formula is:

[0108]

[0109] Among them, J i is the joint reserve quantity of the i-th spare part, n i is the spare parts demand of the i-th spare part, avg(w) is the mean of the importance scores of all spare parts, which is used to standardize the importance scores, σ S is the standard deviation of the importance scores of all spare parts, which is used to measure the dispersion of the importance scores. i>avg(w), that is, the joint reserve is calculated only when the importance score of the spare parts exceeds the average importance of all spare parts.

[0110] By collecting historical data of spare parts, key information about spare parts is obtained, and the extracted data is cleaned and standardized to ensure the data quality and integrity of subsequent analysis, providing accurate basic data for spare parts importance scoring and inventory demand, improving the accuracy and reliability of spare parts management decisions, and reducing erroneous decisions caused by data quality issues;

[0111] By calculating the comprehensive impact factors, risk cost factors and importance scores of spare parts, the impact of spare parts on nuclear power plant operations and potential risks are quantitatively assessed, and key spare parts are identified to ensure that these spare parts receive priority attention and appropriate reserves, thus improving the pertinence and effectiveness of spare parts management.

[0112] By calculating the probability of spare parts consumption within the mission time, the accuracy of spare parts demand forecasting is improved. The probability of spare parts consumption of all equipment is integrated using convolution operations to calculate the probability of spare parts guarantee, thus avoiding the situation of too much or too little spare parts reserves, reducing inventory costs and improving the economic benefits of spare parts management.

[0113] Based on the initial inventory and spare parts demand, the joint reserve of spare parts is calculated by comprehensively considering factors such as spare parts importance score, demand and cost, and the optimal configuration of spare parts inventory is achieved, which not only ensures the availability of important spare parts, but also avoids the cost burden caused by excessive reserves.

[0114] This embodiment also provides a management system for effectively establishing an initial inventory of spare parts for a nuclear power plant, including: a data collection module responsible for collecting historical data of spare parts;

[0115] The preprocessing module is responsible for preprocessing the extracted data;

[0116] The spare parts importance assessment module is responsible for determining the importance score of spare parts based on their comprehensive impact and risk cost;

[0117] The demand forecasting module is responsible for determining the corresponding spare parts demand based on the spare parts consumption probability;

[0118] The inventory optimization module is responsible for jointly reserving spare parts with higher importance scores based on the initial inventory and spare parts demand.

[0119] This embodiment also provides a computer device, which is applicable to the management method for effectively establishing the initial inventory of spare parts for nuclear power plants, and includes: a memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the management method for effectively establishing the initial inventory of spare parts for nuclear power plants as proposed in the above embodiment.

[0120] The computer device may be a terminal, and the computer device includes a processor, a memory, a communication interface, a display screen and an input device connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The display screen of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device may be a touch layer covering the display screen, or a key, trackball or touchpad provided on the housing of the computer device, or an external keyboard, touchpad or mouse, etc.

[0121] This embodiment also provides a storage medium on which a computer program is stored. When the program is executed by a processor, it implements the management method for effectively establishing the initial inventory of spare parts for a nuclear power plant as proposed in the above embodiment; the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read Only Memory, referred to as EPROM), programmable read-only memory (Programmable Red-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0122] In summary, the present invention aims to collect and preprocess the historical data of spare parts, use advanced data analysis technology and algorithm models, comprehensively consider the comprehensive impact of spare parts, risk cost, and consumption probability, etc., to determine the importance score and demand forecast of spare parts, and then formulate a reasonable joint reserve strategy for important spare parts to optimize spare parts inventory management and improve the efficiency and economic benefits of spare parts management in nuclear power plants. Compared with the prior art, the present invention is expected to achieve beneficial effects in the following aspects: first, improve the accuracy of spare parts demand forecast, second, guide the reasonable reserve of spare parts by quantifying the importance score of spare parts, and third, reduce inventory costs and improve the actual use efficiency of spare parts through scientific joint reserve strategies.

[0123] Example 2, referring to Table 1, is the second example of the present invention. To further verify the advancement of the present invention, experimental simulation data of a management method for effectively establishing an initial inventory of spare parts in a nuclear power plant are provided.

[0124] In order to verify the superiority of the present invention in effectively establishing the management of the initial inventory of spare parts in a nuclear power plant, this embodiment selects a typical nuclear power plant scenario for testing. The nuclear power plant has various types of equipment, each of which is equipped with different spare parts. The test aims to optimize the initial inventory of spare parts through the method of the present invention and compare it with the existing spare parts management method.

[0125] First, we collected the historical data of spare parts usage in the past five years, including spare parts prices, usage frequency, mean time between failures, and mean time to repair. Next, we preprocessed the data, including data cleaning and standardization, to ensure data accuracy and consistency.

[0126] Subsequently, the importance score of spare parts is determined based on the comprehensive impact and risk cost of spare parts. Specifically, the comprehensive impact factor, risk cost factor and importance score of spare parts are calculated. Among them, the comprehensive impact factor takes into account the mission time, expected life, failure frequency and other factors of spare parts; the risk cost factor takes into account the cost, repair time, supply time, unavailable time, procurement difficulty, replacement cost and potential loss of spare parts. These indicators jointly determine the importance score of spare parts.

[0127] Next, the demand for the corresponding spare parts is determined based on the probability of spare parts consumption. For each device, the probability of spare parts consumption within the mission time is calculated, and the probability of spare parts consumption of all devices is combined using convolution operations to calculate the spare parts guarantee probability. The spare parts demand is determined by continuously adjusting the number of spare parts until the spare parts guarantee probability exceeds the pre-set threshold K.

[0128] Finally, a comprehensive calculation method is used to determine the initial inventory, and the spare parts with higher importance scores are jointly reserved. The initial inventory and joint reserve of spare parts are determined by calculating the cost index and safety stock factor of spare parts.

[0129] In order to compare the effects of the method of the present invention with the existing spare parts management method, two different spare parts management methods are selected for comparison. The first is a traditional method based on historical average consumption, and the second is a method based on expert experience and simple statistical analysis. These two methods are more common in practical applications and therefore have good representativeness.

[0130] Table 1

[0131]

[0132] As can be seen from the above table, for spare parts A, B, C, and D, the initial inventory determined by the method of the present invention is increased compared with the traditional method and the expert experience method, especially for spare parts with higher importance scores (such as spare parts A and C). This means that the method of the present invention can more accurately assess the importance of spare parts and determine a more reasonable initial inventory based on this to ensure sufficient supply of important spare parts.

[0133] Taking spare part A as an example, the initial inventory determined by the method of the present invention is 22 pieces, while the traditional method is only 18 pieces and the expert experience method is 24 pieces. The initial inventory of the method of the present invention is both higher than the traditional method and lower than the expert experience method. This shows that the method of the present invention can effectively control inventory costs while ensuring the supply of spare parts, avoiding the problem of capital occupation and increased management costs caused by excessive inventory.

[0134] For spare parts B and D, although the importance scores are relatively low, the method of the present invention can also determine a reasonable initial inventory based on the demand and importance scores of the spare parts. Compared with the traditional method, the initial inventory of the method of the present invention is closer to the actual demand, and compared with the expert experience method, the method of the present invention can better balance the relationship between spare parts supply and cost.

[0135] In summary, the method of the present invention not only accurately evaluates the importance of spare parts, but also reasonably determines the initial inventory and joint reserve of spare parts by comprehensively considering multiple factors such as the importance score, demand and cost of spare parts, thereby effectively improving the efficiency and economy of spare parts management. Compared with the existing spare parts management methods, the method of the present invention has significant advantages, especially in ensuring sufficient supply of important spare parts while effectively controlling inventory costs, thus bringing substantial improvements to spare parts management in nuclear power plants.

[0136] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A management method for effectively establishing an initial inventory of spare parts for a nuclear power plant, characterized by: include, Collect historical data of spare parts and pre-process the extracted data; Determine the importance score of spare parts based on their comprehensive impact and risk cost; Determine the corresponding spare parts demand based on the spare parts consumption probability; Based on the initial inventory and spare parts demand, spare parts with higher importance scores are jointly reserved, and the joint reserve of spare parts is calculated after comprehensive consideration.

2. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 1, characterized in that: The historical data includes the price, usage frequency, mean time between failures and mean time to repair of spare parts; The preprocessing includes data cleaning and standardization.

3. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 2, characterized in that: Determining the importance score of spare parts according to the comprehensive impact and risk cost of spare parts includes the following steps: Calculate the comprehensive impact factor I of spare parts i , the formula is, Calculate the risk cost factor R of spare parts i , the formula is, Determine the importance score of the spare part i , the formula is, Among them, t i is the task time of the i-th spare part, l i is the expected life of the i-th spare part, f i is the failure frequency of the ith spare part, c i is the cost of the i-th spare part, r i is the repair time of the i-th spare part, s i is the supply time of the i-th spare part, u i is the unavailable time of the i-th spare part, p i is the purchasing difficulty of the i-th spare part, v i is the replacement cost of the i-th spare part, d i is the potential loss of the i-th spare part, w i is the importance score of the i-th spare part, and N is the total number of spare parts.

4. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 3, characterized in that: According to the probability of spare parts consumption, the demand for corresponding spare parts is determined, including the following steps: For each device p, calculate the task time T p The probability R of consuming k spare parts within a period 1+k , the probability is calculated by the following formula: Where a is the inverse of the expected value of the spare part life, b is the inverse of the expected value of the maintenance time, x, y, z represent the k-th maintenance time, the first k-1 maintenance times, and the total life of the equipment before the k-th spare part is installed, respectively; Use convolution operation to integrate the probability array of all equipment consuming k spare parts to calculate the probability array of integrated l spare parts; When all equipment consumes k spare parts, calculate the total probability G of consuming the first l+n spare parts, that is, the spare parts guarantee probability: Among them, T l+k It is the probability of consuming l spare parts after all equipment consumes k spare parts; Initialize the spare parts quantity n=0 and the spare parts guarantee probability G=0. For each device, repeatedly calculate the spare parts consumption probability and accumulate the spare parts quantity until G is greater than the preset spare parts guarantee probability threshold K. When the spare parts guarantee probability G exceeds the threshold K for the first time, the current spare parts quantity n is the required spare parts demand.

5. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 4, characterized in that: The initial inventory is determined by a comprehensive calculation method, expressed as, Among them, Y i is the initial inventory of spare parts, F i is the comprehensive score of the i-th spare part, G j is the weighted score of the price and mean failure interval of the jth spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, C i is the cost index of the i-th spare part, avg(C) is the average cost index of all spare parts, MTBF i is the mean time between failures of the i-th spare part, MTTR i is the average repair time of the i-th spare part, Usa i is the usage frequency of the i-th spare part, max(Usa) is the highest usage frequency among all spare parts, S i is the safety stock factor of the ith spare part, which is based on the importance and price level of the spare part, and N is the number of spare parts.

6. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 5, characterized in that: The cost index expression of the spare parts is: Among them, C i is the cost index of the i-th spare part, P i is the price of the i-th spare part, max(P) is the highest price among all spare parts, and w i is the importance score of the i-th spare part, and avg(S) is the average importance score of all spare parts; The safety stock factor expression of the spare parts is: Among them, S i is the safety stock factor of the i-th spare part, P i is the price of the i-th spare part, avg(P) is the average price of all spare parts, and w i Score the importance of the i-th spare part.

7. The management method for effectively establishing the initial inventory of spare parts for a nuclear power plant according to claim 6, characterized in that: The spare parts with importance scores exceeding the average importance of all spare parts are jointly reserved, and the formula is: Among them, J i is the joint reserve quantity of the i-th spare part, n i is the spare parts demand of the i-th spare part, avg(w) is the mean of the importance scores of all spare parts, σ S The standard deviation of the importance scores for all spare parts.

8. A management system for effectively establishing the initial inventory of nuclear power plant spare parts based on any one of claims 1 to 7, characterized in that: include, Data collection module, responsible for collecting historical data of spare parts; The preprocessing module is responsible for preprocessing the extracted data; The spare parts importance assessment module is responsible for determining the importance score of spare parts based on their comprehensive impact and risk cost; The demand forecasting module is responsible for determining the corresponding spare parts demand based on the spare parts consumption probability; The inventory optimization module is responsible for jointly reserving spare parts with higher importance scores based on the initial inventory and spare parts demand.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the management method for effectively establishing the initial inventory of spare parts for a nuclear power plant as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the management method for effectively establishing the initial inventory of spare parts for a nuclear power plant as described in any one of claims 1 to 7 are implemented.

Images